program Problem2_2;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var

  fin : textFile;
  flag:boolean;
  x : array of integer;
  y : array of integer;
  i, n, a, b : integer;

begin

  assignfile (fin, 'input.txt');
  reset (fin);
  flag := false;
  readln(fin, n);
  setlength (x, n);
  setlength (y, n);
  for i := 0 to n-1 do
  begin
    read (fin, x[i]);
    readln (fin, y[i]);
  end;
  a := 0;
  x[n]:= x[0];
  y[n]:= y[0];
  x[n+1]:= y[1];
  x[n+1]:= y[1];
  {a := 0;  }
  for i:= 1 to n-1 do
  begin
    b := a;
    a := x[i-1] * y[i] - x[i] * y[i-1] + x[i] * y[i+1] - x[i+1] * y[i] + x[i+1] * y[i-1] - x[i-1] * y[i+1];
    if (b * a <0) then
    begin
      flag := true;
      break;
    end;
  end;
  if (flag) then
    writeln ('Yeeeah :)')
  else
    writeln ('Ohh noo :(');
  closefile (fin);
  readln;
end.
 